專四完型填空及答案

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1、2000年一．Thedifferencebetweenaliquidandagasisobvious(26)theconditionsoftemperatureandpressurecommonlyfoundatthesurfaceoftheEarth.Aliquidcanbekeptinanopencontainerand(27)ittothelevelofafreesurface.Agasformsnofreesurfacebut(28)todiffusethroughoutthespaceavailable;itmust(29)bekeptinaclo

2、sedcontainer,as(30)aplanet'satmosphere.Thedistinctionwasaprominentfeatureofearlytheories(31)thephasesofmatter.Inthenineteenthcentury,forexample,onetheorymaintainedthataliquidcouldbe"dissolved"inavaporwithoutlosingitsidentity,andanothertheoryheldthatthetwophasesare(32)differentkinds

3、ofmolecules(分子).Thetheoriesnowprevailing(33)aquitedifferentapproachbyemphasizingwhatliquidsandgaseshaveincommon.Theyarebothformsofmatterthathavenopermanentstructureandtheybothfloweasilly.Theyarefluids.?　　The(34)similarlyofliquidsandgasesbecomesclearlyapparentwhenthetemperatureandp

4、ressureareraisedsomewhat.(35)Aclosedcontainerpartiallyfilledwithaliquidisheated.Theliquidexpandsor(36)becomeslessdense;someofitevaporates.(37),thevaporabovetheliquidsurfacebecomesdenserastheevaporatedmoleculesareaddedtoit.Thecombinationoftemperatureanddpressure(38)thedensitiesbecom

5、eequalis(39)thecriticalpoint.Abovethecriticalpointtheliquidandthegascannolongerbe(40);thereis?asingle,undifferentiatedfluidphaseofuniformdensity.　　26.?A.in??B.onC.under??D.beyond　　27.?A.fills??B.befilled?C.filling?D.tofill　　28.?A.intends?B.tendsC.inclines?D.contends　　29.?A.ho

6、wever?B.neverthelessC.so?D.therefore　　30．A.intheeventof????B.inthecaseofC.withaviewto??D.withreferenceto31.?A.havingdescribed??B.describedC.describing??D.tohavedescribed　　32.?A.madeupof???B.consistedofC.constitutedof???D.madefrom　　33.?A.apply??B.adaptC.take??D.conduct　　34

7、.?A.elementary??B.crucialC.rudimentary?D.fundamental　　35.?A.Suppose????B.TosupposeC.Beingsupposed?D.Supposed　　36.?A.inaword??B.inthemeantimeC.inotherwords??D.inthatcase　　37.?A.Similarly?B.IncontrastC.FurthermoreD.Instead　　38.?A.onthat?B.onwhichC.atthat??D.atwhich　　39.?A.kn

8、own?B.definedC.called??D.